CORALS FROM THE INFERIOR OOLITE. 133 



strong, presenting concentric folds or wrinkles, and ceasing at a considerable distance from 

 the calicular margin. Calice somewhat convex, with a small shallow central fossula. 

 Columella rudimentary, and formed by a certain number of denticules arising from the 

 inner edge of the septa. Five cycla of septa ; but the last cyclum not developed on one 

 side of some of the systems. The Septa straight, closely set, exsert, terminated by a well- 

 denticulated edge, and slightly striate on their lateral surfaces, but very feebly granulated ; 

 the primary ones rather thick, especially towards the middle ; the secondary ones almost 

 as large as those of the first cyclum ; the others unequally developed according to the orders 

 to which they belong. 



The largest specimens which we have seen were almost one inch in diameter, and about 

 four lines high. 



This fossil is found in the Inferior Oohte in France, as well as in England. Specimens 

 from Castle Cary, Somersetshire, exist in the collections of the Museum of Practical 

 Geology and of the Paris Museum ; specimens found at Dundry have been communicated 

 to us by Mr. Bowerbank and Mr. Pratt ; others, in Mr. Walton's collection, were found at 

 Silcombe, Hawkesbury, and Camdown, in Somersetshire, at West Swillets in Dorsetshire, 

 and at Sudbury in Gloucester shu-e. M. Terquem, of Metz, has met with the same species 

 in the environs of that city. 



Montlivaltia Delabechii has a very peculiar form, and may be considered as intermediate 

 between the species which are cylindrical with a convex basis, such as M. Waterhouse^ and 

 M. regidaris -^ and those which are quite discoidal, as M. depressed and Jf". lens.^ In these 

 last two the wall is entirely horizontal, as in a CycloHte ; and the epitheca does not extend 

 over any part of the exterior edge of the septa ; whereas in M. Delabechii the epitheca 

 ascends from the basis some way up the sides of the corallum ; in that respect it resembles 

 the inferior portion of a Montlivaltia Waterhousei or a M. regularis, and it might be 

 considered as a variety of one of those specimens, were it not for its septa being more 

 numerous and straight. It also resembles very much M. cyclolitoides,^ but is taller, and is 

 also characterised by the strong striae which exist on the lateral surfaces of the septa. M. 

 decipiens^ to which Prof. M'Coy refers this fossil, differs from it by its form, which is much 

 more conical, by its being broadly adherent, and not showing any vestiges of a columella. 



7. Montlivaltia lens. Tab. XXVI, figs. 7, la, lb, 7c; fig. 8. 



Corallum discoidal, very short, and much resembling a Cyclolite by its form. Wall 

 quite horizontal, or somewhat concave towards the centre of the basis, and covered with a 



^ Tab. xxvii, fig. 7. ^ D'Orbigny, Prod, de Paleont., vol. i, p. 346. 



^ Tab. xxix, fig. 5. * Tab. xxvi, fig. 7. 



* ThecophylUa cycloUtoides, Milne Edwards and J. Hairae, Ann. des Sc. Nat., s. ."J, vol. xi, p. 2-12. 



* Aathophyllum decipiens, Goldfuss, Petref. Germ., vol. i, tab. Ixv, fig. 3. 



